VULNERABILITY INTELLIGENCE
CVE-2026-70368
CVSS score6.5 MEDIUM
EPSS probability0.35%
CISA KEVNot currently listed
Published2026-08-04
Last modified2026-08-06
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Description
A stack-based out-of-bounds read vulnerability exists in the "s_vlog" function of stunnel, when handling oversized log messages via "vsnprintf". A remote attacker with network access to a stunnel service can send protocol inputs that trigger a log message longer than 1024 bytes, leading to an out-of-bounds stack read and a potential crash. In certain corner cases, the same vulnerability could be used to replace a series of trailing "\n" characters with "\0".
Weakness classification
- secalert@redhat.com: CWE-125